/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/ViewModels/HierarchyEditor/NiagaraHierarchyViewModelBase.h
To know what object this ObjectProperty is referring to, a persistent guid that can be mapped back to an object is required.
void Initialize ( [FGuid](API\Runtime\Core\Misc\FGuid) ObjectGuid, [FString](API\Runtime\Core\Containers\FString) PropertyName )